Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc58418f3bf83de4…

MALICIOUS

PDF

95.5 KB Created: 2021-08-14 05:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2f6466f34862a08ee495cb94c17e85cf SHA-1: 98c5f697866c2070a3f8570c3921c2472f80b329 SHA-256: fc58418f3bf83de4cf3250c92d01b02669c8d8dde0cd8c94e6375b60551d4480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous embedded URLs, many hosted on potentially compromised or disposable domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/a12qtrig12abpcsqc985u3f9sh/94147942902.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a896b785c4b---jifajazuv.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/fozoxunipuruvibetosut.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/pamilikepaxupadama.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/23310746405.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/dupuxugekerodatim.pdfIn PDF document text
    • http://vizcsap.hu/files/file/73986289072.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc0d9e5a0---36364513281.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/69092904193.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/7jot4qe9fl4kmk2ctk9esanos5/waxexu.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/46728755291.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bue0j05r6da5kjbmd5s383kk1r/jexowa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f34d09a9dbc396e6f7900f88b24e0b63/45169099829.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/435daecb76b5853a67aa8c5cae765cc6/87868286313.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/a8o6sqan3vcc43dds1g4evqpa6/togotowedop.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d97e78a18044eeca14a3c666473840a2/pibanir.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/gifute.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cddad653a---zakuv.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/fuxunumiverizug.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/68259328332.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/timonuwuwe.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089602deb4d5---vugizerukizerutovat.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609668801d2bc---jizogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=legendary+z+mini+warriors+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00011b56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11B56 22680 bytes
SHA-256: ddbae3f130c448bcb8c6f25f522a50cfd210a515dbc75cc6aa4781176b96dfb3
font_00_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 10900 bytes
SHA-256: 7fd975061ed1caa855172e776d2461bf27b0b583d6df93156096a4e15b4af31d
font_03_sfnt_off0001432a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432A 16868 bytes
SHA-256: 62351d06fdd3394eed2e9944070b6b280e0192e0a20f6ef7231db26efcb97af0

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